DOI: 10.1016/j.quascirev.2017.06.013
论文题名: Sensitivity of Last Interglacial sea-level high stands to ice sheet configuration during Marine Isotope Stage 6
作者: Dendy S. ; Austermann J. ; Creveling J.R. ; Mitrovica J.X.
刊名: Quaternary Science Reviews
出版年: 2017
卷: 171 起始页码: 234
结束页码: 244
语种: 英语
Scopus关键词: Forecasting
; Geochronology
; Geographical distribution
; Geology
; Glacial geology
; Glaciers
; Isotopes
; Sea level
; Sensitivity analysis
; Tectonics
; Geographic variability
; Glacial isostatic adjustment
; Global mean sea levels
; Marine isotope stages
; Northern Hemispheres
; Numerical predictions
; Oxygen isotope records
; Viscoelastic response
; Ice
英文摘要: Estimates of peak global mean sea level (GMSL) during the Last Interglacial (LIG, ∼129-116 ka) based on geological sea level high-stand markers require a correction for the contaminating influence of glacial isostatic adjustment (GIA). This correction is obtained by calculating the viscoelastic response of the Earth to changes in the ice and ocean load prior to and following the LIG. While ice retreat over the last deglaciation is relatively well constrained, changes in ice cover prior to the LIG are more uncertain. We investigate the sensitivity of numerical predictions of GIA during the LIG to variations in the geometry of pre-LIG ice cover and the timing of the deglaciation into the LIG, with a particular focus on Marine Isotope Stage (MIS) 6 (∼190-130 ka). We demonstrate that reconstructing the pre-LIG ice history by replicating the last glacial cycle back in time, rather than using ice volume approximations based on oxygen isotope records, can introduce errors in LIG high-stand predictions of ∼5 m at sites on the peripheral bulge of major ice complexes, and up to ∼2 m at far-field sites. We also demonstrate that predictions of LIG sea level are more sensitive to the geographic distribution of ice cover during MIS 6 than previously recognized. Adopting simulations which vary the relative size of Late Pleistocene ice cover over North America and Eurasia can yield a change in predicted high-stand elevations of ∼5 m in both the near and far field of northern hemisphere ice sheets. This far-field sensitivity arises, in part, from the reorientation of Earth's rotation axis during MIS 6, which in turn drives sea-level changes with a distinct geographic signature. In future work we will apply the insights gained here to re-evaluate the observed geographic variability in geological high-stand markers of LIG age and estimates of GMSL based upon them. © 2017 Elsevier Ltd 资助项目: Dendy, S.
; School of Earth, Society and Environment, University of IllinoisUnited States
; 电子邮件: sdendy2@illini.edu
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59135
Appears in Collections: 过去全球变化的重建
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作者单位: Lamont-Doherty Earth Observatory, Columbia University, United States; Department of Earth and Planetary Sciences, Harvard University, United States; Department of Earth Sciences, University of Cambridge, United Kingdom; College of Earth, Ocean, and Atmospheric Sciences, Oregon State University, United States
Recommended Citation:
Dendy S.,Austermann J.,Creveling J.R.,et al. Sensitivity of Last Interglacial sea-level high stands to ice sheet configuration during Marine Isotope Stage 6[J]. Quaternary Science Reviews,2017-01-01,171